My observations...
- you can do it from the top or the bottom. It's a bit of reach either way. I think having access from the bottom will help. Bottom access is not a requirement however.
- be very sure to get the power disconnected before you start, mark all the wires you pull from the solenoid, etc.
- you'll need some reasonable sockets and extensions to get in to the starter bolts, plan to work around the brake booster, manifold brace, oil canister, throttle cables...blah blah blah.
Generally, this is not a hard job but the access is a bit cramped. I think you'll have 3 nuts to undo for wiring and 2 starter mounting bolts to deal with. Access from the bottom may help you save your back but you'll still have to reach up pretty high.
Bellevue WA
90 535iM - not much stock remains. 3.7 liters, ported head, cammed, 3.73 diffy, M5 brakes, MAFed, yadda yadda yadda
86 Porsche 951 - Track Toy